Getting to Know Java - Beginning Java Programming: The Object-Oriented Approach - page 16

Java Runtime Environment (JRE)

Java API

Java.applet
Java.io
Java.math
Java.util
...

Class loader
Bytecode verifier

Java Virtual Machine (JVM)

Interpreter Just in Time (JIT) compiler

Garbage collector Threads and synchronization

figure 2-2

Java application programming Interface (apI)
The Java Application Programming Interface (API) is the set of prepackaged, ready-made Java com-
ponents grouped into libraries. It provides programmers with many useful capabilities. Some popu-
lar API libraries are listed in Table 2-2.

table 2-2: Example Libraries from the Java API

Java libr ary functionalit y

Support for creating graphical user interfaces (GUIs)

Java.awt; Java.swing

Functionality to create applets

Java.applet

Functionality to create Java beans

Java.beans

Support for I/O through files, keyboard, network, and so on

Java.io

Functionality fundamental to the Java programming language

Java.lang

Mathematical routines

Java.math

Security functions

Java.security

Support for accessing relational databases by means of SQL

Java.sql

Text support

Java.text

Various programming utilities

Java.util

Support for image I/O

Javax.imageIO

Support for XML handling

Javax.xml